When is the last date a Cub Scout may work on Wolf electives? 
  
I've assumed that it's the last day of 2nd grade, since the next day they are 3rd graders and, I think, technically Bears. Our pack leadership wasn't sure, and they've had a flexible approach, for example allowing Wolf scouts to work on Wolf electives until the 3rd grade school year starts. 
  
Is there any authoritative guidance on this?